Pump for corrosive liquids.



A. FERRARIS. PUMP FOR CORROSIVE LIQUIDS.I APPLICATIION FILED AUGJZ. 1915.

Patented Nov. '2, 1915.l

,alma

Ava/Mfrs ATTILIO FERRARIS, 0F TURI, ITALY.

PUMP roRfcoREosIvE LIQUIDS.

Specification of Letters Patent.

Application ledAugu'st 12, 1915. Serial No. 45,262.

To all whom it may concern: l

Be it known that I, ATTILIO FERRARIS, a subject of the King of Italy, residing at Turin, Italy, have invented certain new and useful Improvements in Pumps for Corrosive Liquids, ofwhich the following is a full, clear, and eXact specification.

Pumps for corrosive liquids are already known of the type where an inert liquid, for

instance vaseline oil is interposed between the corrosive liquid and the pump piston thusl preventing deterioration of the main organs of the pump. The pumps heretofore used present'however many inconveniences so that they cannot. practically be adopted with success; the greatest of these inconveniences is that no provision is made in order to prevent the corrosive action of the gases which at high temperatures are developed and which may produce very serious deteriorations to the pump piston. Moreover said gas accumulates between the piston and the corrosive liquid forming a pneumatic cushion with the effect of considerably reducing the efficiency of the pump and even of preventing the working of the same. y

My improved pump not only eliminates the said inconvenience but means are provided for feeding the inert liquid tothe pump without dismounting the same or removing any portion of ,it as well as for preventing the air from being sucked in thev pump in the case the corrosive liquid should for any reason be missed and the pump discharged.

The annexed drawing shows a vertical section of a pump constructed according to my present invention.

A connecting rod a driven by any usual form of mechanism controls the piston b sliding in the cylinder c; the latter commuv nicates with the cylmdrical chamber d d" from which leads a pipe e bent at the upper end and communicating with the pipe f which contains the corrosive liquid and further with the pipe pleading the corrosive liquid to the-upper tank where 1t is transferred. Two valves g and h allow the liquid to pass in one direction only; the pipe e leads to the air chamber i which besides having the object .of preventing hammerings helps to obtain the uniformity of the liquid spout. The height where the /pipe f communicates with pipe e as well as the diameter of the latter pipe must be such that the volume of the aa portion of pipe e is greater the upper portion of cylinder c than the pump capacity c. The cylindrical chamber d d must have a diameter greater than that of the pump c in order to prevent the oil ory acid forming emulsion; a sight glass tv situated at the uppermost position which can be attained by the acid, permits of seeing if therefis a sufficient quantity of oil in the chamber d.

The cylinder .c communicates with the chamber cl d through the pipe g whose outlet in 'the said chamber is at a .lower level than the vault 1 from the upper portion of which the discharge pipe provided with .cock if: and spherical valve l, leads to a closed tank o from which two additionall pipes lead: a.discharge pipe provided with cock n and another pipe leading to the bottom of the circular tank s which'surrounds and is provided With the cock m.

lFor the working of the pump the cylinder c, the pipe g and the cavity d are filled with an inert liquidas for instance vaseline oil while the cavity d and the pipe e are filled with the corrosive liquid to be transf erred.

The gas bubbles produced by the acid, specially in the case of liquids at a high temperature, are allowed to pass from the cavity d under the vault 1' and are pushed at each compression phase to the tank o through 'the spherical valve Z which prevents the return of the gas.- When, after a long working of the pump the pressure which has gradually Increased in the tank o prevents the gas bubbles. from going out as described, the cock 7c is closed without stopping the pump and at the same time the cock fn. is opened thus'allowing free discharge of the gas in theatmosphere while the small oil portions that are mechanically transported by the gas fall in the tank s' where the oil which eventually escapes from the piston is also collected.` By opening the cock m the oil passes tothe tank o and by opening the cock 'la the oil returns to the cavity d until it compensates for the escaped' portion. In my `improved pump, therefore the gases which PatenteaN0v.2,1915.

the pump and even stop its working. Moreover should the corrosive liquid fall in the pipe f andthe pump continue its working, the air would be prevented. from entering the chamber d d', 'and thus produce the dis.-A charging rof the pump, as the capacity of the pump is less than the capacity of the zu portion of the pipe e. The cavity d dand the pipe e being lilled with the corrosive liquid the pump is always ready -for working as soon as the liquid again fills the pipe f.-

1. in a Siphon pump for transferring corrosive liquids, a pump cylinder, a piston reciprocating therein, a chamber communicating with the pump cylinderqand containing corrosive liquid' ai'd Yabody of oil interposed between the corrosive liquid and the pump piston, means *leading from the top of said chamberfor' conducting the 'acid gas produced to the atmosphere, means for co1- lecting the oil' carried away by the acid gas and the oil that escapes from the piston, and means for returning the oil to the said chamber.

2. In a siphon pump for corrosive liquids,.-

the combination with the punip cylinder and piston, means for operating the piston, and the chamber communicating with the pump cylinder and containing corrosive liquid and a body of oil interposed between the corrosive liquid and the pump piston, the pump cylinder communicating wlth said chamber the'combination with the pump cylinder and v piston, the chamber communicating with the pump cylinder and containing corrosive -liquid .and a body of oil interposed between the corrosive liquid, andy the. pump piston, of means for conveying from said chamber the acid gas produced, said means including a pipe for discharging the gas yinto the atmosphere, a tank surrounding the upper part of the pump cylinder to 'receive the 4oil escaping from the piston, the

`saiddischarge pipe extending over the said tank whereby oil carried by the gas is dischargedinto said tank, and means for conveying` the oil collected in said tank back to .the s aid chamber.

ln witness whereof, l have hereunto signed my name in the presence of two subscribing witnesses.

v l -A'lTlLlO FERRARS. ``V\/'it11'esses: y

FELso BAZETTA,

CoLvNA L. Sums. 

